diff options
| author | Leon Hwang <leon.hwang@linux.dev> | 2025-09-10 20:57:39 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-09-10 12:34:09 -0700 |
| commit | e25ddfb388c8b7e5f20e3bf38d627fb485003781 (patch) | |
| tree | 537ac7643167b5f3e2c2db28f833ded5e72f519d | |
| parent | a3967baad4d533dc254c31e0d221e51c8d223d58 (diff) | |
bpf: Reject bpf_timer for PREEMPT_RT
When enable CONFIG_PREEMPT_RT, the kernel will warn when run timer
selftests by './test_progs -t timer':
BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
In order to avoid such warning, reject bpf_timer in verifier when
PREEMPT_RT is enabled.
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20250910125740.52172-2-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | kernel/bpf/verifier.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index c89e2b1bc644..9fb1f957a093 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -8547,6 +8547,10 @@ static int process_timer_func(struct bpf_verifier_env *env, int regno, verifier_bug(env, "Two map pointers in a timer helper"); return -EFAULT; } + if (IS_ENABLED(CONFIG_PREEMPT_RT)) { + verbose(env, "bpf_timer cannot be used for PREEMPT_RT.\n"); + return -EOPNOTSUPP; + } meta->map_uid = reg->map_uid; meta->map_ptr = map; return 0; |